Truck concrete mixer



y 1932; G. JAEGER 1,861,416

TRUCK CONCRETE MIXER Filed Nov 30, 1929 Bnnentor GEBHARD JAEGER Patented May 31, 1932 UNITED STATES PATENT OFFICE GEDHABD JAECER, OI COLUMBUS, OHIO, ASSIGNOR TO THE JAEGEB MACHINE CO]!- rm, COLUMBUS, OHIO, A CORPORATION OF OHIO TRUCK CONCRETE mxnn Application filed November 30, 1929. Serial No. 410,825.

This invention relates more especially, as herein illustrated and described, to concrete mixers and transporting devices and an object among others. of the invention is to prol vide improved means whereby thorough mixing of the concrete can be efi'ected either while the apparatus is stationary or while in transit from a place of supply to a place of deposit or use. Other objects will appear from the disclosure herein.

The invention is embodied in the example herein shown and set forth in the following specification the features of novelty being finally claimed.

In the drawings D Figure 1 represents in side elevation partly broken out the elements of the invention.

Fig. 2 is a central longitudinal sectional view of the mixing drum with the mixing anld conveying elements therein shown in fu Fig. 3 is a detail in elevation and section of the forward end of the drum and operating mechanism viewed from the line III Fig. 1.

The mixing drum consists of a cylindrical portion 5 closed with a head 6 at its forward end and having a tapered discharge end 7.

The mixing and conveying elements consist of two diametrically arranged spiral blades 8, 8 secured to the inner wall of the cylindrical portion of the drum and extending into the tapered discharge portion thereof, where the blades are of somewhat greater width. These blades are of such width as to leave an axial space along the axis of the drum, especially in the cylindrical portion of the drum.

Within the drum at the junction of the tapered discharge portion thereof within the cylindrical portion is a spider 9 containing a central bearing 10, and in this bearing is supported the rear end of a rotatable screw conveyor and mixing device 11 the forward end thereof being ournaled in a suitable bearing 12 centrally located in the head 6 of the drum. The pitch of the mixing device 11 is contrary to that of the mixing blades 8, 8, so that upon contrary movements of the drum and screw the tendency is to feed material in the drum in opposite directions.

suitable gear and clutch The discharge end of the drum is provided with a cover 7 made removable by any suit able means and the cylindrical portion of the drum is made with a lateral charging opening provided with a removable cover 13 that may be latched in opening-closin position when the drum is to be rotated or the mlxing operation. However the drum may be charged through the discharge opening if desired.

The mixing drum is shown as supported with its axis horizontal on the chassis 25 of a motor driven truck by means of grooved rollers 14 in which travel circumferential bands 15 fixed .on the drum.

At its forward portion the drum is provided with a circumferential gear rack 16 engaged by a pinion 17 on an ordinary power take-off shaft 18 operated by the motor engine.

At 19 is a box containing the usual or any mechanism with a handle 20 for controlling them and for eflecting the operation of the power take-ofi' shaft 18 at will in either direction and either concurrently with or independently of the usual speed changing gear operated by the lever 21 and the propelling of the motor vehicle. Briefly the drum and mixing devices can be operated while'the vehicle is traveling over the road in the usual way.

The shaft of the screw 11 projects beyond the headof the drum, and upon said projecting portion of the 'screw is a sprocket wheel 22 operated by a sprocket chain 23 driven by a sprocket wheel 24 on the power take-off shaft 18. i

From the construction shown (see Fig. 3) it will be plain that the mixing drum and screw 11 can be operated by the take-ofi5 shaft 18 simultaneously in opposing directions and whether said take-off shaft is operated in one direction or the other. These operations can be controlled by the vehicle driver from his seat and while the vehicle is traveling on the road or while the vehicle is at rest. When the vehicle is in transit and the material being mixed or transported the discharge cover 7 is closed.

To discharge the contents of the mixing drum at the place of use or deposit the drum is turned, in the instance shown anti-clockwise when viewed from the rear. In this case the central screw soon becomes inoperative to greatly feed the material forward in the drum because of the lowering level of the material in the drum. But in the mixing operation with the discharge closed the material is carried back and forth as well as up and down in cascading fashion, the central screw acting also on the cascaded material. A further advantage of the central screw 11 is that pressure of the concrete being mixed on the closed cover 7 a is relieved.

The forms of the parts can be changed without departing from the gist of the invention as claimed.

What I claim is:

1. In a concrete mixing machine, a mixing drum having a mixing and discharging element including a spiral blade carried thereby, said mixing drum mounted on a substantially horizontal axis, a mixing screw journaled in the drum and cooperating in the mixing operation with the mixing and discharging element, and means for operating said drum and screw in opposite directions.

2. In a concrete mixing machine, a mixing drum having a spiral mixing and discharging element carried thereby, a mixin screw journaled in the drum having its pitch 0 posed to that of the mixing and conveying e ement carried by the drum cooperating in the mixing operation with the spiral element and means for simultaneously operating said drum and screw.

3. In a concrete mixing machine, a mixing drum mounted to turn on a substantially horizontal axis and carrying therewith a spiral mixing and discharging element, said drum having a discharge portion and a closure therefor and said discharging element extending to the discharge portion, and a sec- 0nd spiral mixing element journaled in said drum to act on the contents of the drum counter to the action of said first mentioned mixing element, and means for simultaneously rotating said drum and counter-acting mixing element;

4. In a concrete mixing machine, a'mixing drum having a discharge, a spiral mixing,

conveying and discharging element secured therein, and a spiral mixing and conveying element mounted therein to act on the concrete material counter to the action of the first mentioned spiral element, a closure for the discharge of the drum, and means for simultaneously rotating said element.

5. In a concrete mixing machine, a mixing drum having a discharge, a spiral mixing, conveying and discharging element secured therein, and a spiral mixing and conveying element mounted therein to act on the conmay be reversed.

GEBHARD J AEGER. 

